Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 138, Issue 3, Pages 633-635Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2006.06.078
Keywords
adsorption; methylene blue; lemon peel; isotherms; two-parameter isotherms; three-parameter isotherms
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Equilibrium uptake of methylne blue onto lemon peel was fitted to the 2 two-parameter isotherm models namely Freundlich and Langmuir and 3 six-parameter isotherm models namely Redlich-Peterson, Toth, Radke-Prausnitz, Fritz-Schluender, Vieth-Sladek and Sips isotherms by non-linear method. A comparison between two-parameter and three-parameter isotherms was reported. The best fitting isotherm was the Sips isotherm followed by Langmuir isotherm and Redlich-Peterson isotherm equation. Redlich-Peterson isotherm is a special case of Langmuir isotherm when the Redlich-Peterson isotherm constant g was unity. Radke-Prausnitz, Toth, Vieth-Sladek isotherm were the same when the Toth isotherm constant, n(T) and the Radke-Prausnitz isotherm, M-RP are equal to unity and when the Vieth-Sladek isotherm constant, K-VS equals zero. The sorption capacity of lemon peel for methylene blue uptake was found to be 29 mg/g. (c) 2006 Elsevier B.V. All rights reserved.
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